Onaga was introduced in Mortal Kombat: Deadly Alliance under the cryptic name of the "Dragon King", the long-dead ruler of Outworld preceding Shao Kahn. Not much was known about him, except for the fact that his army was deemed undefeatable but, at his untimely death, allowed itself to be mummified and kept in an ancient tomb that remained uncovered until the necromancer Quan Chi stumbled upon it. Onaga is one of the series' characters through which the One Being is said to work through. His most important powers include superhuman strength, resistance to all forms of magic, and the innate power to raise the dead.